工程地质学报2017，Vol.25Issue(4)：943-952,10.DOI:10.13544/j.cnki.jeg.2017.04.007
片岩强度各向异性特征及破坏模式分析
CHARACTERISTIC OF STRENGTH ANISOTROPY AND FAILURE MODES OF SCHIST
摘要
Abstract
This paper examines the anisotropic characteristics of schist.The indoor triaxial compression test is used to obtain the stress-strain curves and the strength and deformation data of schist specimens with three kinds of schistose angles of α =0°,α =45° and α =90°.Then,seven groups of standard cylinder models with different schistose angles are established.The mechanical parameters of model material are selected by back analysis of the laboratory test data.FLAC3D is used to simulate and discusses the failure modes of schist with different schistose angles as well as the schistose angle effect and confining pressure effect influencing compressive strength.The results show that under the condition of triaxial compression,failure modes of schist are mainly divided into shear failure oblique cutting schistose plane and shear sliding failure along schistose plane.The corresponding control structure for deformation and damage is also different.Under the same confining pressure,the compressive strength of schist,changing with schistose inclination,shows the asymmetric "U" type.The maximum compressive strength is always located at α =90°and the minimum distribution at α =45°or α =60°.The enhancement effect of increasing confining pressure on the strength of schist tends to weaken,where the failure mode is the mode of shear-sliding failure along schistose plane.Furthermore,factors impacting on the distribution of maximum compressive strength of anisotropic rock are analyzed by numerical simulation.It is found that uniformity degree of anisotropic rock has important effect on the distribution of the maximum compressive strength.With poor uniformity,the maximum value is located at α =90°.Otherwise,the maximum value appears at α =0°.关键词
片岩/各向异性特征/破坏模式/抗压强度/岩石均匀性Key words
Schist/Anisotropic characteristics/Failure modes/Compressive strength/Uniformity degree of rock分类
天文与地球科学引用本文复制引用
尹晓萌,晏鄂川,崔学杰,王闫超,卓琦斐..片岩强度各向异性特征及破坏模式分析[J].工程地质学报,2017,25(4):943-952,10.基金项目
交通运输行业联合科技攻关项目(2010-353-342-260)资助. （2010-353-342-260）
